Drill.



To all whom 'Lt may concern;

UNrrED STATES PATENTl onirica.v

WALTER E. CARB, or TELLURIDE, COLORADO.

l DRILL.

` Specification of Letters Patent.

Be it known that I, WALTER E. CARR, a citizen of the United` States residing at Telluride, in the county of an Miguel and State of Colorado, have invented certain new and useful Improvements in-Drills, of which the following is a specification.

My invention relates to pneumatic hammer drills, and my purpose is to provide the means for holding, directing and striking a drill that is automatic, easily placed in pos'ition, economical in the use of air, and one that possesses great power and rapidity of stroke. These objects I attain by the device illustrated in the accompanying drawings, in which similar letters of reference indicate like parts throughout the several figures.

Figure 1, is a longitudinal section. Fig.l 2, is a section of the reciprocating valve.

The cylinder 1 having a differential interior, preferably of about one-fourth of an inch, has fitted on one end a drill chuck 2, and a tappet 3 that constitute the closure for that end of said cylinder, and on the other end of said cylinder 1 is fastened the. valve casing 4 that forms the closure for that end, between which closures the hammer piston 5 is made to operate. In the'wall of said cylinder 1 are the conduits 10 and 11 that conduct the motive fluid to the reciprocating valve 7-conduit10 to one end marked b,

and conduit 11 to the other end marked and thus supply therethrough a part of the actuating force `to said valve 7, and in the Wall of said cylinder is also the starting conduit 26, that enters the interior'of said c vlindcr at port 26. l Also through the wall of said cylinder. 1 is cut the exhaust port 12 near the tappet 3, which port allows free exit of air from the conduit 10 torel'ease the reciprocating valve 7, and from the in` terior of the'casing 1 to prevent the cushioning of the hammer piston 5. This conduit '10 is formed in the Wall of the cylinder 1,

j and extends from the bottom. thereof pracduit' 11 commences on the' opposite side at4 through the conduit 11 is conducted the motive fiuid to the other, or a, end of s'aid .reciprocating valve 7. The valve casing 4,

is firmly held against the end of said cylin'` der 1 'by the bolts 6, which bolts 6 also secureto said machine the feed cylinder 23, and the turning handle 33. Within said valve casing 4 is cut a cylindrically shaped valve chamber 8, transverse in position to Patented May 23, 1911.

Application 4filed May 2s, 19o9. serial No. 499,049.

the piston chamber. The said valve chamber 8 is closed at the ends by the threaded plugs 40 and 41, plug 41has a horizontal conduit 34 cut therethrough to form an air exit, and thus prevent the cushioning of said reciprocating valve 7. Within the said valve chamber 8 is made to operate the reciprocating valve 7. The valve chamber 8 is enlarged by four annular channels 15, 16, 17 and 18, concentric with said valve chamber 8 From one of said channels, 18, exhaust ports 19 are cut to the bottom ofthe valve casing 4. From another'of said annular channels, 16, is cut hammer-piston port 2O into the interior of said cylinder 1, and through said port is introduced thev motive fluid to the larger end of the piston hammer 5i Through the valve casing 4, and transverse in direction to the reciprocating valve chamber 8, but on a lower plane thereto is cut the valve chamber 9, from which cham# ber a port 25 is provided, that is in alinement with said starting conduit 26 in the chamber 9, and hollowed out at one end and fitted on the other end with an operating handle.

From the hollowed interior of said.

valve a passageway is provided, similar in. Y

passage Way is cut, slot'like, o r elongated in form, and opposite in direction to said other bc cut.

.` ings Q3.

passage i 'ay, and adjacent tio a similar port tive tluid to enter the feed cylinder 29 of the drill, and hold the drill against the rock to And to release the motive fluid in said :feed cylinder, and to remove tlic drill, t

a port, and a conduit leading,r therefrom, are cut in the periphery et said alve. The reciprocat'iner valve 7 has two circumferential t y t channels cui therein, marked Llo and Lttl.

Channel 4.7, when in position adjacent tothe annular channel lt and 117, and channel 'tt, when in position adjacent to the annular channel 17 and 18 co-act with said channels and form passage ways. or inlet and outlet conduits for the motive fluid.

The hammer piston has its upper portion inade smaller than its lower portion,

Iwhich .lower portion tits lcloselythe lower portion oi the interior ot cylinder 1l. and 'whose upper portion similarly tittedjo the upper. portion ot said cylinder` and adapted totioi'ln a friction joint` tlierebetween, except between the shoulder Ill or? the luinuner piston and 282 in the cylinder. The 'ditl'erence in tht` ot the two parts o't' said piston hammer 5 is preferably about of an inch, as shown at shoulder 31. Around the lower part of said hau'nner piston 5 is cut: an annular channel 30, and ,from the upper' end of' said hammer piston 5, are provided conduits Q52, opening' into said annular chamber 'thftlnouuli the slotted openrlliis annular channel 30 and conduitsl permit the motive fluid that is held inrthe conduit l() and against. the end ot reciprocating valve 7, to escape therethrough when ychannel 3() on the piston haininer is adjacent tothe opening ofyeonduit l0. This releases said valve and permits its return when the motive fluid is applied to the other end, or the a end oi the valve. A ,longitudinal conduit ,35 is' cut internally through said valve 7, and through the flange on said valve is culv a conduit t, the purpose being to `aid conduit 11, andto furnisha part of tl'ieactuating fluid lto the n end et the valve 7, by allowing the motivo fluid to pass through the conduit 35, from flic anuular channel 1G, and supply thereby apart of the inot-ive fluid to the a. end of said valve, the motive fluid exhausting through the conduit 3G, and-passing out through the eX- haust ports 19, thereby supplying a constant pressure on the u end of'said valve that is reduced by the constant 'exhaust through conduit, 36.

ln operation the motive fluid is intr0- duced through a hose that. is threadably connected to the chamber t). nd enters'through port QF, and conduit: 2G, into the cylinder chamber immediately below the shoulder 231,

piston hammer'i. This forces the piston hammer to the end of said chamber, if it is not already there, and the fluid flows through the conduit and strikes the 7J flange of the reciprocating valve 7, and drives it. to the position shown in Fia. 1. The motive fluid is then turned into the feed cylinder Q9, through the valve port Q4; and port 28. This raises the device in position for Work, with the drill in contact with the rock. The rotary valve then turned until the ort in the valve is adjacent to the port 2l in the valve easing at. This position permits the inotire fluid to enter the reciprocating valve. chamber 8 through the annular channels 16 and 1T and pass th rough the hammer piston port and strike the hammer piston 4 with the exhaust force of the full area of the larger end of said fpiston. This force overcomes the constantly maintained opposite torce on the shoulder 31; and the hammer pist on 5 strikes the tappet or drill With the t'ull force of the motive fl-uid on the fac/e, less the area of the annular shoulder 31. d'hent'he hammer piston 5 in its forward l movement reacl'ics` `tlie-ptisition so that the annular channel is adjacent to the upper opening1 of conduit 10, the motive iiuid which bearing` against thc end of the reciprocating,7

4and surrounds tlul Forward portion of the' l Yalvc 7, is released and exhausts through the slotted opening` 23, conduits i2 and exhaust port lf2. This leaves valve 7 ready to receive the reverso or opposite movement. When said piston hammer 5 passes the entrance to conduit 11. the motive fluid from behind the hammer piston 5 strikes the fz end of thc reciprocating valve 7, and forces This action of said valve closes channel 16 and opens channel 1S. The motive fluid behind the hammer piston 5 then exhausts through ports 20, 17, 18 and 19.

` Having thus described niy invention I desire to secure by Letters Patent and claim: 1. In combination with a cylinder having a ditl'crcntlal chamber, a casing` o'n one end channel, as and for the purposes described. 2. In combination Wit-h a cylinder having a differential chamber, a. casing on one end thereof, conduits therein leading in'to said cli-amber, a hammenpiston, a shoulder thereon, meansfor supplying constantfluid piston, means tor supplying motive fluid to the larger end of said hammer-piston,

is not only that in said conduit, but also that l it to thc other end of' the valve chamber 8 pressure on the shoulder of said hainmer`\ thereof, a hammer-piston, a shoulder therefrom said end of` said valvd tothe other A Which means consists of a ,reciprocating valve, two annular channels thereon` a conduit from one of said channels internally i 'through said -Valve to thecnd thereof, and

an exhaust port from said end of said valve to the otherchannel, as and for the purposes described.

' 3; In combination with a cylinder haring a differential chamber, a hammer-piste i, a shoulder thereon, means for supplying constant fluid' pressure on the shoulder of -said hammer-piston, which means consists of conduits in the Wall of said cylinder, means for supplying motive fluid to the larger end of said hammer-piston, which means consists of a reciprocating valve, two annular channels thereon, a conduit from one 'of said channels internally through said valve to 'the end thereof, and an exhaust port from said plyner constant fluid pressure on the shoulend of said valve to the other channehas and for the purpose described.

Lt. n combination with a cylinder having a differential chamber. a casing on one end thereof, ahaiinner-piston, a shoulder thereon, means for supplyingV constant fluid pressure on the shoulder ot' said hammerlpistoii, which means consists of' conduits-iii said casing.: and in the wall of said cylinder, means for supplying motive fluid to the larger end` der ot said hammer-piston` a reciprocating; valve` two annular channels thereon adjacent. to the channels iii said valve chamber, a conduit from one ot said channels on said `\'al\'e internally through said Valve to the end thereof'. and means vfor supplying'constunt reduced fluid pressure to one. end ot' said valve, as and for the purpose described.

t'. ln combination with a cylinder having a differential `chamber. a hammer piston, a shoulder thereon, means `for supplyine constant fluid pressure on the shoulder ot' said hammer piston, means for supplying' motive fluid to the larger end ot said hammer-piston, which means consists o'tI a` reciprocatin;` valve, -two ainiulai channels thereon, a conduit 'from .one ot said channels internally through saidvalve to the end thereof, and an exhaust port t'roin said end of said valve to the other channel, as and for the purpose described. y

7 In combination with a cylinder having a chamber of two different diameters, apiston therein, one portion with less -diameter than the other, means for supplying constant Huid pressure on the shoulder of said hammerpiston, means for supplying motive fluid to the larger end of said hammer-piston, which means consists of a valve chamber, a closure for each end thereof, a reciprocating valve, two annular channels thereon, a conduit'from one of said channels internally through said valve to the end thereof, as and for the purpose described.

8. In a. machine of the class described, the combination of a cylinder, a valve casing on one end, a cylindricaily shaped valve chamber in said casing, two annular channels in said chamber, a reciprocating valve adapted to operate in said chamber, two annular channels thereon, an internal conduit from one ot said last mentioned channels to the end of said valve, an exhaust port trom said end otv said valve to the other channel, and a hannnei-piston adapted to operate iii said cylinder, as and tor the purpose described.

9. l'n a machine of the class described, the combination of. a cylinder, a Valve casinaon one end. a valve chamber insaid casing, a fluid coiiduitfin said casing'. a piston adapted to operate in saidcylinder. t'ormed with one portion ot' said piston ot smaller dianieter than the other and having),l airannular channel cut ii `ar one end. internal longitudinal conduits leading' from the other end of said pistonto said channel, an' annular shoulder on said piston under constant fluid pressure in one direction and means for moving said piston in the other direction. which means consists of a reciprocating valve. adapted to operate iii said valve. chainber, two annular channels thereon, an internal conduit leadinj.,r -from one of said channels to the end ot saidralve and an exhaust conduit from said valve to the other channel.'as and tor the purpose ihiscribed.

it). in a machine ot the class describwl,

the combination of a casino1 a valve chamber therein, t'our annular channels in said casing' concentric with said \'al."e chamber,

'exhaust ports leading; 'from the two outerV of said channels, a cylinder secured to said casing'.v and havinga differential bore. a piston operating in saidcylinder.r a' shoulder thereon, a combined inlety and exhaust. conduit leading" from said Valve chamber into saidfcylinder, a cyliinlrically shaped \'al\'e the ends et which are. of equal area in said` \'al\e chamber adapted to change the direction ot the motive fluid through sald conduit. and means whereby the motive fluid is' constantly supplied lo said shoulder.

Il. lu combination with a cylinder ha \'in; a differential chamber, a hammer-iiiston, a shoulder thereon, means for supplyingA eonstant fluid pressure on the shoulder ol' said hznnmer-piston, means for supplying Ino- Inv testimony tive -to the larger end of said, hammer-piston, which means consists of a reciprocating svalve, two annular channels thereon,. a eon- I fluit from one of said channels internally llVitnesses:

through said value to the end thereof, as L. J. VOOD, and for the purpose described. J. A. PHILLIPS.

whereof I have affixed my slgnatu-re in presence of two Wltnesses.

WALTER E. CARR. 

